Question

I've tried and I have no clue how to do this.

Answer 1

This isn't to diffuclt. So, to the formula for the area of a circle is $2\pi r$, or instead of r, you can put D, which is r times 2

The diameteris 2.5, so, the answer would be

pi times 2.5, where pie = 3.14

So, the answer is 2.5 * 3.14 = 7.85 or 7.9